PCYC 1137-CA - A randomized, multicenter, double-blind, placebo-controlled, Phase 2/3 study of the Bruton’s Tyrosine Kinase inhibitor ibrutinib in combination with nab -paclitaxel and gemcitabine versus placebo in combination with nab-paclitaxel and gemcitabine, in the first line treatment of patients with metastatic pancreatic adenocarcinoma.